Incidentally, Dave and I have been talking lately about how well everyone at our indoor facility is practicing. They're no longer concerned with ball flight (they trust, know, and realize that the ball flight is going to sort itself out just fine if they keep improving) and are putting more and more effort towards actually making changes rather than trying to continue hitting the ball far and towards the targets. They're more easily making swings at 50% speed (i.e. not concerned with hitting the ball far with every swing) and are unconcerned with some shots struck poorly as they're working on making changes.
We've seen more improvement over the winter from our students and, we could argue, from ourselves than we've seen in the same amount of time over the summer months. It's been impressive, and it backs the theory or idea that started this thread.